| Date: | 7–15 July |
| Edition: | 35th |
| Category: | World Tour 250 |
| Draw: | 28S / 16D |
| Prize Money: | €358,425 |
| Surface: | Clay / outdoor |
| Location: | Stuttgart, Germany |
| Venue: | Tennis Club Weissenhof |
| Champs: |  Janko Tipsarević[1] |
| Champd: |  Jérémy Chardy /  Łukasz Kubot[2] |
| Main Name: | Stuttgart Open |
The 2012 MercedesCup was a men's tennis tournament played on outdoor clay courts. It was the 35th edition of the Stuttgart Open, and was part of the ATP World Tour 250 series of the 2012 ATP World Tour. It was held at the Tennis Club Weissenhof in Stuttgart, Germany, from 7 July until 15 July 2012. First-seeded Janko Tipsarević won the singles title.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Serbia | Janko Tipsarević[3] | 8 | 1 | |
 Argentina | Juan Mónaco | 14 | 2 | |
 Australia | Bernard Tomic | 28 | 3 | |
 Spain | Pablo Andújar | 36 | 4 | |
| Robin Haase | 41 | 5 | ||
 Russian Federation | Nikolay Davydenko | 47 | 6 | |
| Poland | Łukasz Kubot | 49 | 7 | |
| Tommy Haas | 50 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Dustin Brown | Christopher Kas | 73 | 1 | |||
| Michael Kohlmann | Philipp Petzschner | 87 | 2 | |||
 Colombia | Juan Sebastián Cabal | Robert Farah | 94 | 3 | ||
 Slovakia | Michal Mertiňák | André Sá | 124 | 4 |
The following pairs received wildcards into the doubles main draw:
See main article: 2012 MercedesCup – Singles.
Janko Tipsarević defeated Juan Mónaco, 6–4, 5–7, 6–3See main article: 2012 MercedesCup – Doubles.
Jérémy Chardy / Łukasz Kubot defeated Michal Mertiňák / 
André Sá 6–1, 6–3